[CursorInfo] Fix bug when performing solver-based cursor info on Self

lib/AST/ASTPrinter.cpp

@@ -81,6 +81,11 @@ const std::function<bool(const ExtensionDecl *)>
 void PrintOptions::setBaseType(Type T) {
   if (T->is<ErrorType>())
     return;
+  if (auto DynamicSelf = T->getAs<DynamicSelfType>()) {
+    // TypeTransformContext requires `T` to have members. Look through dynamic
+    // Self.
+    T = DynamicSelf->getSelfType();
+  }
   TransformContext = TypeTransformContext(T);
 }
 

test/SourceKit/CursorInfo/dynamic_self.swift

@@ -0,0 +1,7 @@
+class UserCollection {
+  static let staticMember = "ABC"
+  func test() {
+    // RUN: %sourcekitd-test -req=cursor -pos=%(line + 1):10 %s -- %s
+    Self.staticMember
+  }
+}